Issue #1081286 by Berdir: Fixed url prefix user/%user/messages is broken when privatemsg_filter is not installed.

#1022404 by Berdir, te-brian: Added drag and drop sorting for list display fields and replaced header theme functions with a hook.

#750566 by Berdir, manarth: Added message delete changed hook and update privatemsg_thread_change_delete() to work like privatemsg_thread_change_status().

Issue #967164 by Berdir: Fixed privatemsg_roles tries to send message to uid 0 for authenticated user role.

#968384 by Berdir: Fixed upgrade path from 6.x-1.3+ and cleaned up indexes in existing 6.x-2.x installs.

#1054206 by te-brian: Added reset argument to be able to clear the static cache in privatemsg_unread_count().

#548188 by Berdir | igorik, BenK: Added  privatemsg_forward module which allows to forward a thread to other users.

#979956 by Berdir | IWasBornToWin: Fixed tagging messages on view thread page doesn't work with a %user url prefix.